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Class: Gem::Requirement

Relationships & Source Files
Namespace Children
Exceptions:
BadRequirementError
Inherits: Object
Defined in: lib/rubygems/requirement.rb

Overview

A Requirement is a set of one or more version restrictions. It supports a few (=, !=, >, <, >=, <=, ~>) different restriction operators.

See Version for a description on how versions and requirements work together in RubyGems.

Constant Summary

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(*requirements) ⇒ Requirement

Constructs a requirement from #requirements. Requirements can be Strings, Gem::Versions, or Arrays of those. nil and duplicate requirements are ignored. An empty set of #requirements is the same as ">= 0".

[ GitHub ] 

  


# File 'lib/rubygems/requirement.rb', line 111



def initialize *requirements
  requirements = requirements.flatten
  requirements.compact!
  requirements.uniq!

  if requirements.empty?
    @requirements = [DefaultRequirement]
  else
    @requirements = requirements.map! { |r| self.class.parse r }
  end
end


  







Class Method Details



  

    .create(input)  
  



  

    

Factory method to create a Requirement object.  Input may be a Version, a String, or nil.  Intended to simplify client code.



If the input is “weird”, the default version requirement is returned.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/requirement.rb', line 51



def self.create input
  case input
  when Gem::Requirement then
    input
  when Gem::Version, Array then
    new input
  else
    if input.respond_to? :to_str then
      new [input.to_str]
    else
      default
    end
  end
end


  








  

    .default  
  



  

    

A default “version requirement” can surely only be '>= 0'.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/requirement.rb', line 69



def self.default
  new '>= 0'
end


  








  

    .parse(obj)  
  



  

    

Parse obj, returning an [op, version] pair. obj can be a String or a Version.



If obj is a String, it can be either a full requirement specification, like ">= 1.2", or a simple version number, like "1.2".



parse("> 1.0")                 # => [">", "1.0"]
parse("1.0")                   # => ["=", "1.0"]
parse(Gem::Version.new("1.0")) # => ["=,  "1.0"]


  



  [ GitHub ]


  

  


# File 'lib/rubygems/requirement.rb', line 85



def self.parse obj
  return ["=", obj] if Gem::Version === obj

  unless PATTERN =~ obj.to_s
    raise BadRequirementError, "Illformed requirement [#{obj.inspect}]"
  end

  if $1 == ">=" && $2 == "0"
    DefaultRequirement
  else
    [$1 || "=", Gem::Version.new($2)]
  end
end


  







Instance Attribute Details



  

    #exact?  ⇒ Boolean  (readonly)
  



  

    

true if the requirement is for only an exact version


  





  


  [ GitHub ]


  

  


# File 'lib/rubygems/requirement.rb', line 164



def exact?
  return false unless @requirements.size == 1
  @requirements[0][0] == "="
end


  








  

    #none?  ⇒ Boolean  (readonly)
  



  

    

true if this gem has no requirements.


  





  


  [ GitHub ]


  

  


# File 'lib/rubygems/requirement.rb', line 153



def none?
  if @requirements.size == 1
    @requirements[0] == DefaultRequirement
  else
    false
  end
end


  








  

    #prerelease?  ⇒ Boolean  (readonly)
  



  

    

A requirement is a prerelease if any of the versions inside of it are prereleases


  





  


  [ GitHub ]


  

  


# File 'lib/rubygems/requirement.rb', line 214



def prerelease?
  requirements.any? { |r| r.last.prerelease? }
end


  








  

    #specific?  ⇒ Boolean  (readonly)
  



  

    

True if the requirement will not always match the latest version.


  





  


  [ GitHub ]


  

  


# File 'lib/rubygems/requirement.rb', line 240



def specific?
  return true if @requirements.length > 1 # GIGO, > 1, > 2 is silly

  not %w[> >=].include? @requirements.first.first # grab the operator
end


  







Instance Method Details



  

    #===(version)  
  



  

    

Alias for #satisfied_by?.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/requirement.rb', line 234



alias :=== :satisfied_by?


  








  

    #=~(version)  
  



  

    

Alias for #satisfied_by?.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/requirement.rb', line 235



alias :=~ :satisfied_by?


  








  

    #concat(new)  
  



  

    

Concatenates the .new requirements onto this requirement.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/requirement.rb', line 126



def concat new
  new = new.flatten
  new.compact!
  new.uniq!
  new = new.map { |r| self.class.parse r }

  @requirements.concat new
end


  








  

    #satisfied_by?(version)  ⇒ Boolean 
    Also known as: #===, #=~
  



  

    

True if version satisfies this Requirement.


  





  
Raises:


    
  
  • 
    (ArgumentError)
  
    • 





  [ GitHub ]


  

  


# File 'lib/rubygems/requirement.rb', line 227



def satisfied_by? version
  raise ArgumentError, "Need a Gem::Version: #{version.inspect}" unless
    Gem::Version === version
  # #28965: syck has a bug with unquoted '=' YAML.loading as YAML::DefaultKey
  requirements.all? { |op, rv| (OPS[op] || OPS["="]).call version, rv }
end